Method of



UNITED STATES PATENT QFFICE'.

FRANCQIS SOHMALZ AND JOHN 'C. FIRMBACH, 0F BROOKLYN, YORK, ASSIGNORS TO THE AMERICAN VALTHAM -WA'ICH COMPANY, OF WAL- 1 TEAM, MASSA OHUSETTS.

METHOD OF APPLYING DESIGN$ TO A EiFE-UIFIGATKM? forming pm of Letters Yatent No. 424,228, dated March 25,1890;v

application filed ram]? 20, 1836. Serial No. 192,724. (lie inodel.)

it n23 whom it may concern:

Be it known that we, Fmeors SCHMALZ and {in Frrmihcn, of Brooklyn, county of Kings and State of New York, have invented certain new and useful Improvements the Method o App y g g s, ($50., to-

toil-Dials, of which the following is'a speoiiafittilOIL M 4 i l This invention'consists in the improved method, hereinafter described, of applying figores, letters, and lines to watch or clock dials another enfi'aeesof like nature.

i carrying out our invention we make an Jary photographicnegative from a drawing or printof the characters and lines to be appiied; to dials, such characters being,- for emniplegthe .ordinals indicating the hours,

the annular lines and spacing-marks as ju'sualiy rnade on watch-dials, and if desired, the

n aizers name, &c;j/The' dial tobc marked. is

reated on itsouter surface with a compound (composed of bichrtinnate of amnionia bieh-romate-of potash, albumen, and water, to. which are addeda few drops ofany suitable blue colnring matter, such; as laundry-b1 ui-n g. The

7 coating thus applied is sensitive to-andcapabio of being hardened" by; exposure tofllight, so that it must be kept f romthelight while, it is being. dried on the di'al. .We-then press the coated side of the dial'closely against the negative and expose the coatingto light, either solar or artificial, passing through the negative; Those portions of the coating which,

are; not protected the opaque portions of thenegat-ive are at once hardened and rentiered, practically insoluble by the light; .the pretected portions remaining'soft and soluble.

Aftera'suitable exposure; the'length of which it d t rmined by ...the character 'i-'t .e light,

thedial is removed, and itspcoated surface is covered. with; ink or coloring-mattercontain; ingpovzdered enamel. We "then-wash the dial e ith water until the soft and soluble pertione of chef-coating and the ink 'thereon'are reacted, the hardened portions of the coating and. the ink or coloring matter adhering thereto rernainin on the dial and conetitut iug a positive or fae sim-ile in color of the transparent portions of the negative. The

rial and incorporate it intothe ink. i

dial is then fired, if enamel-ink has been used, 50

and the process is completed.

prefer to protect the lines and characters left 3 0n the dial by dusting powdered resin, crasphaltu'm ordra onsblood overthehnandthen Q heating the dial to melt the powdered mate- Instead of using the original glass negative,

we may. remove the filin of the negative from, the glass on which it was originally formed and'deposit it on a thin coating: of rubber solution applied to another glass plate, said.

coating being too thin to obstruct light, and f at the same time sufliciently'yieldi-ng to insure periectjcontact between the en tire coated side of" thejdial and' cthe negative andoompensate for any 'slight Variation from a plane surface in either the dial or the glass plate;

We prefer! to" treat" several 7 dials at ence,

using a negative-having any desired number of duplicate designs: ".The negative is placed in aframe for example, like'that used by pho:

tographers in: making photographicprints,

andthe dials are pressed against the mega-V tive by a platen or follower coated with rub- "ber' on the side which bears against the.dials.

W'e'also prefer to interpose annular pieces or Washers of leather, rubber, or other yielding" material between the back of eachdial and the platen, said washers being thiek er than the length of the usual pinsprojecting-from the backs, of the dials and provided with holes to' receivesaid pins. These washers communicate the pressure from the platen to the dials around the centers thereof and do not bear against'the centers of the dials; thus insuring aclose contact of all parts of the coated surface of each dial withthene'gative l by exerting pressure on the marginal portion of the dial, whichis in some. cases slightly: crowning or higher in the center than at the margin.

We claim y The method of applying designs to watch consisting in covering the, face of the dial case diale and analogous articles, the same unexposed portions, than washing off the pm tions of tha coating remaining seluble, ami,

comes insoluble 'on exposure to light, expos- In testimor ing said dial to light under a negative, than. names to ih' applying a liquid enamel or in over the two subscribing whole surface, covering; both the and. Fabrua-vgg 188G.

finally, Ming the dial to set the remaining port-ions 0f the enamel coating, gubsmntiaily described. 

